Is there any way to access the transformed image data specified by an image spec of type imagemagick via elisp? Is it possible to write the transformed image back to disk via elisp?
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Need help/assistance. Trying to perform this in colab. I have a script that creates deepdream outputs as PNG files but want to take those files and apply an 'infinite ouroboros' recursive effect and output as a GIF, is this possible from a single static high resolution PNG image?
I am trying to understand the basics behind Pixbuf and its factory methods new_from_data and new_from_stream.
new_from_data requires a string of bytes containing the image data, and other information such as bits per sample, with and height of image.
What I don't understand is why new_from_stream does not require those additional image information. Then, how can the Pixbuf know how to render the image new_from_stream does not provide any additional information other than the Gio.InputStream ?
new_from_stream() expects to get a stream of a supported image file, equivalent to new_from_file(). All the image formats contain metadata like height and width.
new_from_data() on the other hand expects a pixel buffer, which is essentially just an array of pixels without any metadata.
I have to convert image sequences to a video using 'matlab R2010a' version. What function should I use to load images to a video? In 'Matlab R2013a' version, 'writeVideo' is used. What is the related function of 'writeVideo' in 'R2010a' version?
If your images are created by some Matlab code, then you can always save them as image files (check out the print function), and use some utility (like VirtualDub) to convert the image files to video.
If it is enough to play the image sequence without saving it, then use the movie function.
I would like to know how to load first a low quality UIImage and then load the original UIImage in high quality. Does it have an algorithm to do this in objective-c? I checked it out the class NYXImagesKit but it only works with iOS 5+ because it uses Core Image framework...And i need to work this with iOS 4.3+. Its effect is like Facebook app does.
JUST A edit:
check this out :
http://www.codinghorror.com/blog/2005/12/progressive-image-rendering.html
i want to do the Effect number 2
From the docs:
Incrementally Loading an Image
If you have a very large image, or are loading image data over the web, you may want to create an incremental image source so that you can draw the image data as you accumulate it. You need to perform the following tasks to load an image incrementally from a CFData object:
Create the CFData object for accumulating the image data.
Create an incremental image source by calling the function CGImageSourceCreateIncremental.
Add image data to the CFData object.
Call the function CGImageSourceUpdateData, passing the CFData object and a Boolean value (bool data type) that specifies whether the data parameter contains the entire image, or just partial image data. In any case, the data parameter must contain all the image file data accumulated up to that point.
If you have accumulated enough image data, create an image by calling CGImageSourceCreateImageAtIndex, draw the partial image, and then release it.
Check to see if you have all the data for an image by calling the function CGImageSourceGetStatusAtIndex. If the image is complete, this function returns kCGImageStatusComplete. If the image is not complete, repeat steps 3 and 4 until it is.
Release the incremental image source.
You can refer below link, it may be help you
uiimage-dsp
I used CGImageGetDataProvider and CGDataProviderCopyData and then get a pointer to the data. The first image I tested was a bmp and this method worked great. However, I changed my image to a JPG because I had read something about the Data Provider possibly being relative to the type of image. The length of that data returned indicates that it is 4 when it should be some large number representing the rows and columns of the image.
What I need is I can ask for the Data Provider to be for a bitmap so I can walk through the data uncompressed?
The data you get out of the data provider will be the data that went into creating the image. For instance, if the image was created using CGImageCreateWithJPEGDataProvider, it would be JPEG data. If you want bitmap data, you will need to make a bitmap, perhaps using CGBitmapContextCreate, and draw the image into the bitmap.